python：KeyError: 'trade_date'

This error occurs when you are trying to access a key in a dictionary that does not exist. In this case, it seems like you are trying to access the key 'trade_date' but it is not present in the dictionary.

To fix this error, you should check the dictionary to ensure that the key 'trade_date' exists before trying to access it. You can use the `in` keyword to check if a key exists in a dictionary.

For example:

if 'trade_date' in my_dict:
    # Access the value of the 'trade_date' key
    trade_date = my_dict['trade_date']
else:
    # Handle the case where the 'trade_date' key does not exist
    print("The 'trade_date' key does not exist in the dictionary.")

Alternatively, you can use the `get()` method of the dictionary, which returns `None` if the key does not exist:

# Access the value of the 'trade_date' key, or return None if it does not exist
trade_date = my_dict.get('trade_date')
if trade_date is not None:
    # Do something with the 'trade_date' value
    print(trade_date)
else:
    # Handle the case where the 'trade_date' key does not exist
    print("The 'trade_date' key does not exist in the dictionary.")